Breaking change. Migrate from the deprecated original Android Support
Library to AndroidX. This shouldn't result in any functional changes, but it
requires any Android apps using this plugin to also
migrate if they're
using the original support library.

Breaking change. Upgraded to Gradle 4.1 and Android Studio Gradle plugin
3.0.1. Older Flutter projects need to upgrade their Gradle setup as well in
order to use this version of the plugin. Instructions can be found
here.